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There are a lot of 5 letter word in English that start with "A". Wordle uses only the most common ones. Here is the complete list.

Admit, Abled, Alert, Apply, Abide, Alamo, Adapt, Apple, Armor, Arrow, Alike, Aider, Adopt, Acorn, Agile, Acids, Aorta, Antic, Acted, Award, Aloud, Ample, Angle, Alone, Adore, Ached, Angel, Amber, Ankle, Amuse, Addle, Abase, Allot, Alarm, Agree, Angry, Agent, Alloy, Askew, Abate, Acid, Abbot, Ample, Afloat, Arcus, Adult, Acute, Alter, Alibi, Aisle, Align, Annul, Above, Amity, Alter, Allay, Attic, Anchor, Aware, Alone, Aloe, Affix, Apnea, Arcus, Agent, Amuse, Annoy, Allow, Aider, Ailed, Alarm, Access, Among, Apnea, Award, Arrow, Anger, Adopt, Alert, Acted, Aloe, Adapt, Above, Aider, Align, Adapt, Aches, Acorn, Agave, Attic, Atlas, Anger, Adopt, Abate, Alert, Acted, Abide, Arcus, Anger, Admit, Alloy, Angle, Allot, Aloha, Amuse, Arcus, Angry, Aided, Apple, Apply, Alert, Above, Afore, Ample, Arise, Aimed, Aider, Aloe, Acted, Align, Arrow, Aroma, Adapt, Ample, Agree, Anger, Aided, Ached, Adapt, Arcus, Abide, Alert, Agave, Angel, Aisle, Abate, Addle, Alarm, Alloy, Able, Ached, Amber, Apply, Adore, Abide, Anger, Adopt, Alert, Ample, Agile, Axis, Agree, Aided, Allay, Aorta, Attack, Auger, Affix, Awful, August, Adapt, Access, Award, Alarm, Acute, Arise, Aloe, Agile, Align, Aider, Actor, Amber, Agile, Above.